Correction, Online.nl had failures, which are resolved now. Ofcourse they refused to admit it.

We cannot explain this as you are not providing any information. Which is really obvious as you are not even cutting out the section showing that you have to read and supply that information.... That happens, there are lot of things on your host and the network between your host and the PoP that can cause things to break. What do you mean with "resetting the tunnel" ? We are not answering with junk. We are pointing you to the facts: please provide details. Without those details we cannot do anything as we do not have access to your host. Please note that this is clearly stated but obviously not read by you, otherwise you would have cut the above text out of your reply. But to provide a fact that your tunnel should be working, this is what the PoP reports: Which indicate that your tunnel is even responding properly to the ICMPv6 echo requests that the PoP is sending. Note that if you would have read then you would know where to see those details yourself. Please do not open or comment to tickets when you are unable to read and provide details that we request.